Improvements in heat transfer in thermal desalination operation based on removal of salts using ultrasound pretreatment

Ultrasonics Sonochemistry
Vikram V Banakar Saurabh

Abstract

Scaling is a major problem in the thermal desalination operation which is mainly attributed to the deposition of salts on the tube, thereby increasing the resistance to heat transfer. To reduce or prevent the formation of scale on heat transfer surfaces, treating desalination concentrates and precipitating sparingly soluble salts can be a promising method. In the present work, the effect of ultrasound pretreatment to the synthetically prepared sea water as desalination feed has been investigated with an objective of intensifying salt removal process and avoiding scale formation leading to better heat transfer rates. A lab scale double pipe heat exchanger setup was designed and operated under simulated conditions of the thermal desalination operation. Total operational volume of 2000 ml was used for all experiments with a fixed flow rate of 5 ml/s. To understand the process of scaling, synthetic seawater was prepared as per the ASTM D 1141-98 and was used for scale deposition experiments. The experiments conducted using untreated synthetic seawater confirmed substantial scaling and drop in the heat transfer coefficient from an initial value of 776 W/m2 K to 603 W/m2 K (about 22%) after 24 h operation as compared to deionized wat...Continue Reading

References

Jul 10, 2001·Ultrasonics Sonochemistry·M Sivakumar, A B Pandit
Aug 11, 2004·Ultrasonics Sonochemistry·I Nishida
Jan 27, 2007·Ultrasonics Sonochemistry·M D Luque de Castro, F Priego-Capote
Mar 30, 2012·Ultrasonics Sonochemistry·Nisharg Golash, Parag R Gogate
Oct 24, 2013·Environmental Science and Pollution Research International·George M AyoubMahmoud Al-Hindi
Feb 16, 2019·Ultrasonics Sonochemistry·Sarvesh S Sabnis, Parag R Gogate
Jun 19, 2019·Ultrasonics Sonochemistry·Silvia NalessoJudy Lee

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